fix: coding style and file format for chapter 11, 12, 13, 14 and 15.

eBook/exercises/chapter_11/interfaces_poly2.go

@@ -1,57 +1,58 @@
-// interfaces_poly2.go
-package main
-
-import (
-	"fmt"
-	"math"
-)
-
-type Shaper interface {
-	Area() float32
-}
-
-type Square struct {
-	side float32
-}
-
-func (sq *Square) Area() float32 {
-	return sq.side * sq.side
-}
-
-type Rectangle struct {
-   length, width float32
-}
-
-func (r Rectangle) Area() float32 {
-   return r.length * r.width
-}
-
-type Circle struct {
-	radius float32
-}
-
-func (c *Circle) Area() float32 {
-   return math.Pi * c.radius * c.radius 
-}
-
-func main() {
-   r := Rectangle{5, 3} // Area() of Rectangle needs a value
-   q := &Square{5}      // Area() of Square needs a pointer
-   c := &Circle{2.5}
-   fmt.Println("Looping through shapes for area ...")
-   // shapes := []Shaper{Shaper(r), Shaper(q), Shaper(c)}
-   shapes := []Shaper{r, q, c}
-   for n, _ := range shapes {
-       fmt.Println("Shape details: ", shapes[n])
-       fmt.Println("Area of this shape is: ", shapes[n].Area())
-   }
-}
-/* Output:
-Looping through shapes for area ...
-Shape details:  {5 3}
-Area of this shape is:  15
-Shape details:  &{5}
-Area of this shape is:  25
-Shape details:  &{2.5}
-Area of this shape is:  19.634954
-*/
+// interfaces_poly2.go
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+type Shaper interface {
+	Area() float32
+}
+
+type Square struct {
+	side float32
+}
+
+func (sq *Square) Area() float32 {
+	return sq.side * sq.side
+}
+
+type Rectangle struct {
+	length, width float32
+}
+
+func (r Rectangle) Area() float32 {
+	return r.length * r.width
+}
+
+type Circle struct {
+	radius float32
+}
+
+func (c *Circle) Area() float32 {
+	return math.Pi * c.radius * c.radius
+}
+
+func main() {
+	r := Rectangle{5, 3} // Area() of Rectangle needs a value
+	q := &Square{5}      // Area() of Square needs a pointer
+	c := &Circle{2.5}
+	fmt.Println("Looping through shapes for area ...")
+	// shapes := []Shaper{Shaper(r), Shaper(q), Shaper(c)}
+	shapes := []Shaper{r, q, c}
+	for n := range shapes {
+		fmt.Println("Shape details: ", shapes[n])
+		fmt.Println("Area of this shape is: ", shapes[n].Area())
+	}
+}
+
+/* Output:
+Looping through shapes for area ...
+Shape details:  {5 3}
+Area of this shape is:  15
+Shape details:  &{5}
+Area of this shape is:  25
+Shape details:  &{2.5}
+Area of this shape is:  19.634954
+*/